It worked prior to the upgrade. I tried reinstalling an earlier saved version of my iPhone and that didn’t work either. I have of course tried the usual reboot – soft and hard – as well as removing network settings.

Susendeep D

August 17, 2013 at 11:45 am

If resetting didn't solved the problem,then ask Apple support to replace your device(if under warranty) as searching the forums concluded that they couldn't find any meaningful resolution towards this issue.Wi-fi and Bluetooth works occasionally and stops after that.

Hovsep A

August 13, 2013 at 3:16 pm

reset AirPort Express to accept WPA/WPA2 Personal

1) Open AirPort Utility and click on the Airport Express icon, then click Edit.
2) Click the Wireless tab and change the security setting
3) WPA/WPA2 Personal, Immediately set it back to WPA2 Personal. "Update" button should become active in the lower right corner. clicked Update and follow instructions
or set up a new network connection while in the AirPort utility

turn off cellular data under General -- > Network see if wifi will come back